Environmental Science-Water Research & Technology
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2019
·Vol. 5
·期 4
·672-683
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IF 4.195
Fangshu Qu,Hao Wang,Junguo He,Gongduan Fan,Zhihui Pan,Jiayu Tian,Hongwei Rong,Guibai Li,Huarong Yu
Permeability loss and the low retention efficiency of soluble organics significantly restrict the application of ultrafiltration (UF) for water reclamation. In this work, the tertiary treatment of secondary effluent using UF was investigated under a variety of transmembrane pressures (TMPs) (20–150 kPa) to obtain more insight into fouling by effluent organic matter (EfOM) and its impact on organic rejection, particularly for hydrophobic pharmaceuticals represented by carbamazepine and naproxen. The flux decline and the reversible fouling during secondary effluent filtration were substantially aggravated with increasing TMP, whereas the irreversible fouling was generally reduced, as attributed to restriction of EfOM adhesion to the membrane surface by the fouling layer. The fouling process was successively dominated by pore blocking and cake layer filtration, and the shift in the dominant mechanism was accelerated under higher TMPs. The rejection of EfOM was improved in the presence of a fouling layer, which acted as a secondary filtration medium, particularly at higher TMPs. The maximum rejection of hydrophobic pharmaceuticals by UF was observed in a moderate TMP range (40–60 kPa), probably due to a trade-off between increased fouling layer retention and reduced rejection due to increased wall shear and aggravated cake-enhanced concentration polarization with increasing TMP. The results would encourage the strategy of utilizing the fouling layer for irreversible-fouling restriction and better rejection of hydrophobic PhACs.
研究领域:
环境科学
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水处理工程
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DOI
高影响因子
PETROLEUM SCIENCE AND TECHNOLOGY
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2022
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IF 1.695
Kaixiang Cui,Yufei Xia,Linlin Tian,Shuai Wang,Yongyao He
In order to enhance oil recovery, supercritical CO2 (scCO2) flooding has been applied in many oilfields to extract oil and gas post primary recovery. However, it causes serious scaling problems in the reservoir, oil well and production tubing. In this article, the produced water quality before and after scCO2 flooding in carbonate reservoirs are analyzed. The scaling trend of produced water before and after scCO2 flooding was calculated by using the Davis-stiff saturation index and Ryznar stability index methods. Static experiments and scanning electron microscope (SEM) are used to study the scale inhibition performance and mechanism of HEDP, ATMP, MA-AA, and PAA on CaCO3 in produced water before and after scCO2 flooding. The results show that after scCO2 flooding, the quality of produced water changes obviously, thus the scaling trend of produced water increases, the growth of CaCO3 crystal is affected and the scale inhibition efficiency of conventional scale inhibitors decreases.
研究领域:
石油工程
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化学工程
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DOI
高影响因子
International Journal of Environmental Research and Public Health
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2018
·Vol. 15
·期 7
·1454
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IF 2.145
Xianze Wang,Zhongmou Liu,Zhian Ying,Mingxin Huo,Wu Yang
In the current study, graphene oxide, Fe3+, and Fe2+were used for the synthesis of magnetic graphene oxide (MGO) by an in situ chemical coprecipitation method. Scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction were used to characterize the well-prepared MGO. The prepared MGO was used as an adsorbent to remove five typical estrogens (estrone (E1), 17β-estradiol (E2), 17α-ethinylestradiol (17α-E2), estriol (E3), and synthetic estrogen (EE2)) at the ppb level from spiked ultrapure water and wastewater treatment plant effluent. The results indicated that the MGO can efficiently remove estrogens from both spiked ultrapure water and wastewater treatment plant effluent in 30 min at wide pH ranges from 3 to 11. The temperature could significantly affect removal performance. A removal efficiency of more than 90% was obtained at 35 °C in just 5 min, but at least 60 min was needed to get the same removal efficiency at 5 °C. In addition, an average of almost 80% of the estrogens can still be removed after 5 cycles of MGO regeneration but less than 40% can be reached after 10 cycles. These results indicate that MGO has potential for practical applications to remove lower levels of estrogens from real water matrixes and merits further evaluation.Keywords:estrogens;magnetic graphene oxide;adsorption;wastewater treatment plant effluent
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Chun Ding,Xuan Zhang,Shu Xiong,Liang Shen,Ming Yi,Boyang Liu,Yan Wang
In this study, an organophosphonate scale inhibitor, ethylenediamine tetra(methylenephosphonic acid) sodium salt (EDTMPA-Na) draw solution, was adopted for alleviating the membrane fouling in the forward osmosis (FO) application of produced water treatment. Compared with the typical NaCl draw solution, the employment of EDTMPA-Na draw solution can alleviate the membrane fouling effectively and therefore achieve a higher water recovery rate (60.6%) after a continuous 48-h test. And the mechanism of membrane fouling control with EDTMPA-Na draw solution has been systemically explored by varying the feed or draw solution compositions. The results turn out that the leakage of EDTMPA-Na draw solute to the feed solution can alleviate the formation of gypsum scales on the membrane surface effectively, ascribed to its excellent scale inhibition ability and the unique diffusion route of the draw solute (resulting in a relative higher concentration of EDTMPA-Na near the membrane surface) in FO process. And the alleviation of membrane scaling can further mitigate the accumulation of organic foulant on the FO membrane . This study may provide an efficient strategy for alleviating the membrane fouling in the FO application of produced water treatment.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Haiqing Chang,Naiming Liu,Fangshu Qu,Xiaoxiang Cheng,Zhiwei Zhou,Ying Liang,Ying Yu,Heng Liang
Membrane fouling is the Achilles heel of membrane-based technologies. Severe membrane fouling occurs when a single microfiltration (MF) membrane is used to treat shale gas produced water (SGPW). Activated by Fe(II), sodium percarbonate (SPC) oxidation combined with aluminum sulfate coagulation was used in this study to evaluate the alleviation of MF fouling for the treatment of two typical SGPW samples with different water quality characteristics from Sichuan Basin. Results showed that pre-treated by oxidation and coagulation, more than 88% of turbidity, 11%–23% of UV 254 , and 11%-36% of DOC were removed. With the increase in SPC dosage, there was a decrease in fluorescent organics, primarily reducing soluble microbial by-product-like components by up to 37.0% for sample 1 and aromatic protein and soluble microbial by-product-like components by up to 66.7% and 71.2% for sample 2, respectively. Compared to low normalized fluxes (2%-6%) for the raw SGPW, 61%-79% of normalized fluxes were obtained using the combination of 10 mmol/L SPC and 0.9 mmol/L Al 2 (SO 4 ) 3 ·18H 2 O. There was a general evolution of complete blocking to intermediate blocking or cake layer filtration for membrane fouling mechanism. Scanning electron microscopy observation, deposited foulants on membrane surface and Fourier transform infrared analysis further confirmed the superior performance of the combination of SPC oxidation and coagulation. Correlation analysis showed that UV 254 ( R 2 = 0.79–0.95) played the most significant role in membrane fouling. Overall, this combined pretreatment process showed a great potential in MF membrane fouling control during the treatment of SGPW.
研究领域:
环境科学
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水处理工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Rui Ma,Xiaoxiang Cheng,Xinsheng Luo,Tao Yang,Daoji Wu,Heng Liang
Herein, sodium hypochlorite (NaClO) and peroxomonosulfate (PMS) were systematically compared in enhancing vacuum ultraviolet (VUV) oxidation for alleviating ultrafiltration membrane fouling of effluent organic matter. Results indicated that VUV/NaClO pre-treatment exhibited significantly better performance than VUV/PMS, with the irreversible fouling resistance reduced by 64 %. Simultaneously, 96 % of fluorescent substances were removed by VUV/NaClO, and an apparent decrease in surface deposits was observed, with membrane pores exposed and clearly visible. The calculation results through the extended Derjaguin-Landau-Verwey-Overbeek theory indicated that the enhanced hydrophilicity of pollutants reduced the tendency of pollutants to adhere to the membrane surface, leading to the weakening of membrane fouling degree. In the VUV/PMS process, HO • and SO 4 •– were detected with steady-state concentrations of 8.55 × 10 -14 and 1.53 × 10 -13 M. By contrast, the VUV/NaClO system generated HO • , Cl • , ClO • , and Cl 2 •– with steady-state concentrations of 1.15 × 10 -13 , 8.79 × 10 -14 , 7.30 × 10 -13 and 1.50 × 10 -13 M. In conclusion, VUV/NaClO pre-treatment demonstrated high efficiency and significant potential in improving water quality and decreasing membrane fouling in secondary effluent treatment.
研究领域:
环境科学
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水处理工程
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DOI
高影响因子
WATER RESEARCH
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2024
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IF 11.4
Zhengxuan Ji,Jiaxuan Wang,Zhongsen Yan,Caihong Liu,Zhe Liu,Haiqing Chang,Fangshu Qu,Heng Liang
Substantial volumes of hazardous shale gas produced water (SGPW) generated in unconventional natural gas exploration. Membrane distillation (MD) is a promising approach for SGPW desalination, while membrane fouling, wetting, and permeate deterioration restrict MD application. The integration of gravity-driven membrane (GDM) with MD process was proposed to improve MD performance, and different pretreatment methods (i.e., oxidation, coagulation, and granular filtration) were systematically investigated. Results showed that pretreatment released GDM fouling and improved permeate quality by enrich certain microbes’ community (e.g., Proteobacteria and Nitrosomonadaceae ), greatly ensured the efficient desalination of MD. Pretreatment greatly influences GDM fouling layer morphology, leading to different flux performance. Thick/rough/hydrophilic fouling layer formed after coagulation, and thin/loose fouling layer formed after silica sand filtration improved GDM flux by 2.92 and 1.9 times, respectively. Moreover, the beneficial utilization of adsorption-biodegradation effects significantly enhanced GDM permeate quality. 100 % of ammonia and 53.99 % of UV 254 were efficiently removed after zeolite filtration-GDM and granular activated carbon filtration-GDM, respectively. Compared to the surged conductivity (41.29 μS/cm) and severe flux decline (>82 %) under water recovery rate of 75 % observed in single MD for SGPW treatment, GDM economically controlled permeate conductivity (1.39-19.9 μS/cm) and MD fouling (flux decline=8.3 %-27.5 %). Exploring the mechanisms, the GDM-MD process has similarity with Janus MD membrane in SGPW treatment, significantly reduced MD fouling and wetting.
研究领域:
环境科学
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生物技术
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Guichang Chen,Jinlan Wen,Yang Yu,Mai Liu,Guoqiang Liu
Previous studies found that the inhabitation of filamentous bacteria on the support materials with large apertures in dynamic membrane bioreactor (DMBR) could stabilize the DM structure and resulted in stable effluent quality. However, it is hard to cultivate the filamentous bacteria on support materials in DMBR intentionally. In present study, a polyvinyl alcohol (PVA) nanofiber layer was coated on 180-μm nylon mesh to simulate the inhabitation of filamentous bacteria. The nanofiber coated mesh with 1 h spinning time (referred as PVA-1h) had a similar porosity (14.9%) to that of 25-μm nylon mesh and dominant pore size of 1.0–2.5 μm. Short-term test indicated that the PVA-1h had a low initial effluent turbidity of 5.3 NTU and could form DM within 5 min. Long-term test in DMBR demonstrated that better and more stable effluent quality (0.71 ± 0.31 NTU) was achieved by PVA-1h compared to typical used support materials of 25-μm mesh (1.04 ± 0.60 NTU). However, the PVA-1h had an operation flux of 30–50 L/(m 2 ·h) with a water head loss ≤2 cm, which was comparable with the 25-μm mesh but much greater than that of 2.6-μm mesh (<5 L/(m 2 ·h)). In addition, the filtration resistance change between the PVA-1h and 25-μm mesh were very similar. Therefore, this study demonstrated that with proper density of nanofiber as the skeletons, DMs would be formed more quickly and stably, resulting in better and more stable effluent quality in DMBR without sacrificing operation flux.
研究领域:
环境工程
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生物学
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DOI
高影响因子
LANGMUIR
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2024
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IF 3.7
Fanxi Yang,Jinling Zhang,Jie Pan,Yangli Liu,Yanchong Yu,Shebin Wang
Corrosion is an unavoidable issue that steel encounters during service; however, the generic methods employed for corrosion prevention often need high cost or preparation conditions. In this study, a facile chemical replacement deposition method was proposed to realize an anticorrosion superhydrophobic coating on a X80 steel surface. The growth mechanism of the rough structure and its impact on the wettability of the superhydrophobic coating were analyzed. The superhydrophobic coating, deposited for 50 s and modified for 30 min, achieved optimal electrochemical properties and a maximum water contact angle. The immersion test, in the saturated CO2 oilfield produced water, demonstrated the better corrosion resistance of superhydrophobic coating than X80 steel. Correspondingly, a kinetic corrosion model was established to analyze the anticorrosion mechanism. In summary, this method significantly improves the corrosion resistance of X80 steel and is attractive for other industrial fields.
研究领域:
材料科学
·
腐蚀与防护
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Shijie Tang,Yilin Lu,Qian Xu,Zhiping Chen,Ming Duan,Shenwen Fang
Imine bond is a kind of dynamic covalent bonds, in this paper, hydrophobic chain was introduced into polyethyleneimine (PEI) through imine bond, and a series of hydrophobic modified PEI were synthesized as flocculants for flotation-flocculation treatment of produced water. The hydrophobic modified PEI had much better flotation-flocculation performance than that of PEI. When the concentration was 20 mg/L and treatment was 10 min, the best hydrophobic modified PEI had the turbidity reduction rate of more than 95 %. Especially, in a short period of time, the flocs formed by the hydrophobic modified PEI can have a great decrease in adhesiveness under pH=4 due to the dissociation of imine bonds, which is good for the produced water treatment because the viscous flocs can be effectively processed. In addition, the mechanism study showed that the hydrophobic modified PEI can adsorb on the surfaces of bubbles and oil droplets to improve the collision efficiency and adhesion efficiency between bubbles and oil droplets, thus possessing good flotation-flocculation performance. This paper provides a novel degradable flocculant for produced water treatment.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
Energies
·
2021
·Vol. 15
·期 1
·153
·
IF 3.004
Erdong Yao,Hang Xu,Yuan Li,Xuesong Ren,Hao Bai,Fujian Zhou
Economical and environmental concerns have forced the oil and gas industry to consider reusing flowback and produced water for fracturing operations. The major challenge is that the high-salinity of flowback water usually prevents its compatibility with several fracturing fluid additives. In this paper, the authors explored an economic and effective method to prepare guar fracturing fluids with different salinity waters. The main research idea was to use chelating agents to mask metal ions, such as calcium and magnesium, that are harmful to crosslinking. Firstly, a complexometric titration test was conducted to measure the chelating ability of three chelating agents. Secondly, through viscosity, crosslinking, and hanging tests, it was verified that the complex masking method could cope with the problem of high-valence metal ions affecting crosslinking. Thirdly, the preferred chelating agent was mixed with several other additives, including thickeners, crosslinkers, and pH regulators, to prepare the novel guar fracturing fluid. The comprehensive performances of the novel fluid system were tested such as temperature and shear resistance, friction reduction, gel-breaking performance, and core damage rate. The results show that the organophosphate chelating agent (i.e., CA-5) had the greatest ability to chelate calcium and magnesium ions. There was a good linear relationship between the dosage of CA-5 and the total molar concentration of calcium and magnesium ions in brine water. The main mechanism was that the chelating agent formed a complex with calcium and magnesium ions at a chelation ratio of 1:5. The test results of the comprehensive performance evaluation indicate that the prepared guar fracturing fluid met the requirements for field application, and the lower the salinity of the flowback water, the more it is economical and effective.Keywords:flowback and produced water;chelating agent;complex masking method;crosslinker;chelation ratio
研究领域:
石油工程
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环境科学
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DOI
高影响因子
Journal of Water Process Engineering
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2022
·
IF 7.34
Xiaoyue Zhang,Xiujun Wang,Xiaoli Ren,Qingqing Tang,Shenwen Fang,Ming Duan
Air flotation cyclone is a potentially efficient method to improve the treatment efficiency of heavy oil produced water in offshore fields. For its practical application, it is of great significance to develop a flocculant that can flocculate air bubbles and oil droplets together to form oil aerated flocs. In this paper, a novel flocculant capable of rapidly forming oil aerated flocs was prepared and the formation conditions and mechanism of oil aerated flocs were investigated. Firstly, copolymer (PDAMPE-NH) was synthesized by free radical solution copolymerization of N-(3-dimethylaminopropyl) methacrylamide (DPM), diallylamine (DAA) and block polyether macromonomer (PEP) as the monomers . Then, the molecular weight of PDAMPE-NH was increased by using polyethylene glycol diacrylate (PEG-DA) as a chain extender. Finally, the target flocculant DA was obtained by protonating the tertiary amine group in the copolymer with formic acid . The protonated tertiary amine group in DA can capture oil droplets, and the polyether group in DA can capture air bubbles. When the DA dosage was 500 mg/L and bubble size was in range of 20 μm to100 μm, the oil aerated flocs were formed, and the oil content of heavy oil produced water reduced from 7250 mg/L to less than 100 mg/L within 90 s. Microscopic observation found that there were three stages for oil aerated flocs formation and the formation of oil-coated bubbles was the key step. The reported results can provide a reference for the fast treatment of heavy oil produced water in offshore fields.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）